کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1328625 1499952 2005 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis and application of functional polyethylene graft copolymers by atom transfer radical polymerization
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Synthesis and application of functional polyethylene graft copolymers by atom transfer radical polymerization
چکیده انگلیسی

This investigation attempts to elucidate the copolymerization reaction ethylene and p-methylstyrene via the homogeneous metallocene catalyst, Et(Ind)2ZrCl2. With increasing of p-methylstyrene concentration, the poly[ethylene-co-(p-methylstyrene)] copolymer shows systematical decrease of melting temperature and crystallinity and increase of glass transition temperature. The benzylic protons of p-methylstyrene are ready for numerous chemical reactions, such as halogenation and oxidation, which can introduce functional groups at the p-methyl group position under mild reaction conditions. With the bromination reaction of poly[ethylene-co-(p-methylstyrene)], polyethylene graft copolymers, such as polyethylene-g-poly(methyl methacrylate) and polyethylene-g-polystyrene can be prepared via atomic transfer radical polymerization. The following selective bromination reaction of p-methylstyrene units in the copolymer and the subsequent radical graft-from polymerization were effective methods of producing polymeric side chains with well-defined structure. The products were characterized by nuclear magnetic resonance, gel-permeation chromatography, differential scanning calorimetry, and thermal gravimetric analysis. Additionally, the morphology of PE/PMMA and PE/PMMA/PE-g-PMMA blend are compared by using scanning electron microscope.

This investigation attempts to elucidate the copolymerization reaction ethylene and p-methylstyrene (MS) via the homogeneous metallocene catalyst, Et(Ind)2ZrCl2. With increasing of p-methylstyrene concentration, the poly(ethylene-co-p-methylstyrene) copolymer shows systematical decrease of melting temperature and crystallinity and increase of glass transition temperature. With the bromination reaction of poly(ethylene-co-p-methylstyrene), polyethylene graft copolymers can be prepared via atomic transfer radical polymerization.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Organometallic Chemistry - Volume 690, Issue 26, 15 December 2005, Pages 6300–6308
نویسندگان
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